Subject: Re: couple of issues
From: Kevin Cameron x3251 (Kevin.Cameron@nsc.com)
Date: Wed Feb 21 2001 - 09:33:24 PST
> From owner-verilog-ams@eda.org Tue Feb 20 21:28:08 2001
>
>
> Ian,
>
> here are a couple of issues I'd like to add;
>
> 1. Section 6.7.5.1 cross function
>
> The behavior of cross during DC and during mixed-signal initialization
> is not described.
>
> We (Cadence) are preparing a description/proposal on this issue and will
> send it out soon.
Logically I would have thought it would have to be inactive - are you planning
something else?
> 2. Section 4.4.11 Laplace transform filters
> and Section 4.4.12 Z-transform filters
>
> Both these sections talk about poles/zeros and their conjugates
> but they don't define exactly what a conjugate is.
>
> For example are the following conjugates?
>
> 4 + 8.0000001j and 4 - 8j
>
> Basically I think it is a good idea if we allow some numerical
> tolerance when checking if two poles/zeros are conjugate. Something along
> the lines of; "two numbers are considered conjugate if they have a non-zero
> imaginary parts, their real parts match within 0.1% and their imaginary
> parts match within 0.1%"
>
> This was an issue raised by one of our customers,
It's usually a bad idea to hardwire that kind of thing, can we just tack an
extra (optional) argument onto the transform function?
> --Martin
BTW, where does everyone stand on attributes - is everyone implementing
the general purpose attribute scheme?
Kev.
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